Multilever jack



Filed March 22, 1959 2 Sheets-Sheet l fdwifiiiia ATTORNEY.

*6 BY W Feb. 3, 1942. E. MOLLOY MULTILEVER JACK v Filed March 22, 1939 2 Sheets-Sheet 2 BY Edward flfw ATTORNEY.

Patented Feb. 3, 1942 UNITED STATES PATENT OFFICE MULTILEVER JACK Edward Molloy, New York, N. Y.

Application March 22, 1939, Serial No. 263,479

12 Claims. 74-107) The purpose of this invention is to provide an improved device for drawing plates and the like together for riveting and welding, in which the force adapted to be applied by a single operator is materially multiplied by leverage, making it possible for one operator to draw the plates together with considerable force.

The invention is a jack adapted to be placed against the surface of a flat or curved plate, with a jack pin adapted to extend therefrom throughrivet openings in the plate, and another plate adapted to be riveted thereto with a nut adapted to be placed on the end of the jack pin, and with suitable jaws and levers whereby the operator may draw the plates together through the jack pin with considerable force.

In riveting plates particularly used on the sides and in the bulk-head of ships, tanks, or other structural work such as bridges and buildings, the plates are held in position by bolts, and, as these plates are not exactly true, and also because it is necessary to bend them slightly in some cases, the surface of one plate does not register snugly against the surface of another, and, therefore, before riveting the plates together, it is desirable to draw them up so that one is positively in engagement with the other, and, whereas many devices have been provided for this purpose, these devices have been found objectionable because of the inefficiency of operation, or because they are cumbersome or bulky to handle, or because they require special contrivances objectionable to the rivetor, and, therefore, most plates are drawn together by bolts and nuts of various types and designs, and it will be appreciated that it is only possible to obtain a relatively small leverage with a wrench or even an extension therefrom on bolts and nuts of this type.

The object of this invention is, therefore, to provide a relatively simple device for cinching up plates and the like adapted to be riveted, in which the plates may be drawn together with considerable force.

Another object is to provide a device for drawing structural elements together before riveting by which the elements may be drawn together through the normal rivet holes.

Another object is to provide a device for drawing structural element together before riveting in which one operator can exert considerable force for drawing the elements together.

weight thereof does not prohibit operation by one man.

Another object is to provide means in combination with a device for drawing structural elements together by which the elements may be same time adapted to secure the elements together with considerable force and by positive means.

And a still further object is to providea device for drawing and holding elements together which is of a relatively simple and economical construction.

With these ends in view the invention embodies a jack having a base adapted to be placed against plates, a jack pin extending from said base and adapted to extend through rivet holes in the plates, a lever pivotally mounted in said base adjacent said jack pin and having a movable jaw adapted to engage said jack pin, friction means adapted to positively grip and hold said jack pin, a cam adapted to engage an outer end of said lever for operating the same, and a crank adapted to operate said cam or lever; and, in combination therewith, retaining pins and nuts having cam shaped devices in said nuts for clamping said retaining pins in the holding position.

Other features and advantages of the invention will appear from the following description taken in connection with the drawings, wherein:

Figure 1 shows a general view of the device with parts broken away.

Figure 2 is a detail showing a section through one end of the base, with the near side omitted and parts broken away.

Figure 3 is a view showing an end elevation of the base.

Figure 4 is a similar view showing a cross section through the device substantially on line 4-4 of Figure 1.

Figure 5 is a view on a relatively small scale showing the complete device with the operating lever in the upper position before being moved downward by the cam. I

Figure 6 is a detailshowing the retaining pin and clamping nut therefor.

Figure 7 is a plan view of the retaining pin nu Figure 8 is a cross section through the retaining pin nut on line 88 of Figure 7.

Figure 9 is a detail showing a section through the end of the crank with the ratchet and ratchet wheel shown therein.

In the drawings the device is shown as it may be made, wherein numeral l indicates the base, numeral 2, the jack pin slidably mounted in the base, numeral 3, the operating lever, and numeral 4, the crank.

The base I is formed with parallel sides secured together by bolts 5, and the upper portions of these sides extend upward forming side members 6 and 1, the outer ends of which extend downward to the base forming members 8 and 9, with gear teeth forming racks l and H in their forward edges, and with their outer edges 12 forming cam surfaces adapted to engage rollers l3 rotatably mounted on the outer end I4 of the lever 3. The lever 3 is also provided with gears l5 and IS on a shaft 11, the shaft being rotatably mounted in a bearing I3 of the lever 3, and the outer end having a hexagonal extension adapted to receive the crank 4 enabling the gears i5 and I6 to be rotated by the crank if desired. The crank 3 is also provided with a roller l9 rotatably mounted in a bearing 20, and this roller is. positioned to be engaged by a cam 2| fixedly mounted on a shaft 22 rotatably mounted in the upper part of the base. The outer end of the shaft is provided with a hexagonal section 23 adapted to receive a similarly shaped socket 24 of a ratchet wheel 25 rotatably held in the end of the crank 4. The crank is provided with a pawl'26 adapted to engage the teeth of the wheel 25, and this is resiliently held against the teeth by a spring 21, permitting the ratchet to slip over the teeth when the crank is turned in the opposite direction. Another hexagonal projecting end may extend from the opposite end of the shaft 22, permitting the device to be operated from either side or as may be desired. It will be noted that the outer end of the lever 3 may also be moved downward by the cam 2|, however the crank 4 may also be placed on the pin l1, and this may be rotated in a counter-clockwise direction, causing the gears I5 and I 6 to travel downward in the racks I0 and The opposite end of the lever 3 is provided with a slotted hole 28 through which it is mounted on a pin 29 in the sides of the base I, the ends of the pin being covered by the plates 30, and the end of the lever is provided with a jaw 3| having a socket 32 in which a movable jaw '33 is positioned, and this jaw is provided with teeth 34 that engage teeth 35 in the head 36 of the jack pin 2, and it will be noted that, as the outer end of the lever 3 is forced downwardflohe jaw 33 will draw the jack pin 2 upward, and, as the socket 32 would normally travel through an are described from the pivot point or fulcrum of the lever, the lever is provided with a slotted opening in which it is pivoted, permitting it to slide backward or forward, and the movement thereof is governed by the rollers 13 on the surfaces l2, causing the socket 312 to move upward in a straight line parallel to the axis of the pin 2, thereby preventing binding or bending of the pm.

The movable jaw 33 is provided with small pins 31 that extend into slots 38 in the sides of the base I, as shown in dotted lines in Figure 2, and the slots are provided withsprings 39 which guide the pins, urging them forward inall positions, holding the pins in engagement with the forward side of the slot when the jaw 33 is moved downward or as it slides over the teeth. These slots 38 are provided in both sides of the base, and the jaws 33 are provided with pins at both sides extending into the slots, thereby positively holding and guiding the jaws.

The head 36 of the jack pin 2 is mounted with wings 40 and 4| extending into slots 42 and 43, however the slots are slightly larger than the wings permitting freedom of movement, and the head is positively held against rollers 44 and 45 adapted to hold the head with the wings substantially in the centers of the slots. These roll- Zrs 44 and 45 are freely mounted on pins 46 and The head 36 is also provided with a tapering slot 48 in the back into which a cam 49, mounted on a shaft 50, extends, and the outer end of the shaft is provided with a lever 5| by which the cam 49 may be raised to release the head 36 with the jaw 33 in the free position, however the cam 49 is resiliently held downward by a spring 52 mounted on a pin '53, and, as the jack pin 2 isdrawn upward by the lever13 and jaw 33, the cam 49 will grip and hold the pin in substantially any position, thereby making it possible. for the movable jaw 33 to slide back downward for another bite or grip.

The jack pin 2 is provided with a slip nut 54 having wings 55 at the sides, and this is provided with segmental teeth adapted to slip over the threads 55 on the pin 2 until it is substantially against the plate, and then it may be turned through an angle of substantially so that it will engage the threads '56, thereby holding it relatively close to the surface of a plate indicated by the numeral 51, with the base I resting upon a plate indicated by the ninneral 58, and with the jackpin' 2 extending through holes 59-.

In combination with this device it is necessary to use retaining pins to hold the plates together after they are drawn together by the jack pin 2, and, therefore, retaining pins 60 are provided as illustrated in Figures 6- to 9, and these are formed with round shanks 60 and fiat parts 6|, with the fiat parts extending through nuts 62- adapted to be placed against the plates, and, when these are in place, the pins maybe held in the nuts by cams, 63. having extending ends 64 by which the cams may be rotated, and the cams are shaped so that when rotated in a counter-clockwise direction the cam surface E5 will bend the pin against a similarly shaped surface 66. in the nut 62, thereby positively gripping and holding the pin through the flat portion The ends of the cams, 6.3 are provided with cam-shaped wings 6 1 and. 68 that engage oppositely positioned camshaped surfaces 69 and 10 in the nut, thereby causing the sides of the nut to spread so that the cam will snap andlock in position when holding the pins, whereaawith the movement continued, the pins are released as the cam surfaces.

ride over the similar shaped surfaces in the nuts,

thereby freeing the pins from the cams and nuts 66.

the numeral 7.2, gradually arrives at the position shown in Figure 6, and forces a pin into the recess 66, thereby slightly bending the pin. To release the pin the cam 63 is again moved in the counter-clockwise direction until the point 13 arrives at the point of engaging the pin, and this is sufficient to release the pin. The nut may then be removed from the pin, and the pin withdrawn.

It will be understood that changes may be made in the construction without departing from the spirit of the invention. One of which changes may be in the use of a frame or base of any other type or design, another may be in the useof a jack pin of any other type, another may be in the use of other means for holding or connecting the different parts, and still another may be in the use of levers of any other type or design, or in the use of other means for mounting and operating the levers.

The construction will be readily understood from the foregoing description. In use the device,

may be provided as shown and described, and it will be noted that the base I may be placed against a plate having a fiat or curved surface or a plate or object of substantially any shape even though wedges or lugs may be used for spherical or other odd shaped surfaces, and, as this device is placed in position, the jack pin 2 is placed through the rivet holes of two plates, and an operator on the opposite side of the plates places the wing nut on the jack pin. The operator then moves the crank 4 upward and downward, the ratchet 25 therein moving the cam 2| around, and thereby forcing the roller l9 and the lever 3 downward, with the opposite end thereof drawing the jack pin 2 upward and cinching the plates together. This movement may be repeated if necessary, however in the final drawing up movement the crank 4 may be placed upon a hexagonal nut or extension 14 at the side of one of the sprockets l5 and I6, and, by turning the sprocket in a counter-clockwise direction, this end of the ment or cinching up of the pin.

The cam 49 will then look and hold the jack pin in place while retaining pins 60 are placed through openings at each side of the jack, and these pins are inserted from one side with the nut 62 placed over the fiat ends on the opposite side of the plate, and these are secured in place by the cams 63 as hereinbefore described. After the retaining pins have been secured in position, the cam 49 is released by the lever 5i, and the wing nut may then be removed from the opposite side of the jack pin 2. The jack is then free and may be moved to another position and the entire process may be repeated.

It will be noted that, although this device is particularly adapted for drawing plates together for riveting, it may also be used for welding, and, as it exerts considerable pressure, it is adapted for stamping, shearing and piercing metals.

Having thus fully described the invention, what I claim as new and desire to secure by Letters Patent is:

1. A power device comprising a frame with a member extending therefrom, a lever pivotally mounted in the frame adjacent said extending member, with the adjacent end connected to the extending member, and the opposite end extending a considerable distance beyond the pivot point, and means engaging said extending end, said power device being further characterized in that the engaging means comprises a cam positioned to engage the extending end of said lever, and a relatively long crank for operating said cam, said crank having a ratchet through which the cam is operated.

2. A power device comprisinga frame with a member extending therefrom, a lever pivotally mounted in the frame adjacent said extending member, with the adjacent end connected to the extending member, and the opposite end extending a considerable distance beyond the pivot point, and means engaging said extending end, said power device being further characterized in that the engaging means comprises a cam positioned to engage the extending end of said lever, and a relatively long crank for operating said cam; and further characterized by sprockets on the lever engaging racks on the frame for operating said lever downward as the sprockets-are rotated.

3. A power device comprising a frame with a member extending therefrom, a lever pivotally mounted in the frame adjacent said extending member, with the adjacent end connected to the extending member, and the opposite end extending a considerable distance beyond the pivot point, and means engaging said extending end, said power device being further characterized in that the engaging means comprises a cam positioned to engage the extending end of said lever, and a relatively long crank for operating said cam, and further characterized by means locking and securing said extending member in substantially any position.

4. A power device comprising a frame with a member extending therefrom, a lever pivotally mounted in the frame adjacent said extending member, with the adjacent end connected to the extending member, and the opposite end extending a considerable distance beyond the pivot point, and means engaging said extending end, said power device being further characterized in that the engaging means comprises a cam positioned to engage the extending end of said lever, and a relatively long crank for operating said cam, and further characterized by a cam positioned to engage and hold said extending member, and means releasing the cam.

5. A power device comprising a frame with a member extending therefrom, a lever pivotally mounted in the frame adjacent said extending member, with the adjacent end connected to the extending member, and the opposite end extending a considerable distance beyond the pivot point, and means engaging said extending end, said power device being further characterized in that the engaging means comprises a cam positioned to engage the extending end of said lever, and a relatively long crank for operating said cam, and further characterized in that the lever is mounted through a slotted opening permitting sliding movement thereof.

6. A multi-lever jack comprising a frame, a jack pin slidably mounted in and extending from the frame, a cam positioned toengage said jack pin for gripping and holding it in different positions in the frame, a lever fulcrumed adjacent said jack pin having a relatively long outer end, a jaw mounted in said lever and positioned to engage the jack pin for drawing it inward, and mechanical means through which the outer end of said lever may be operated to draw the said jack pin into the frame.

7. A device, as described in claim 6, characterized in that the said mechanical means comprises a cam and means operating the cam.

8. A device, as described in claim 6 in which the said mechanical means comprises a cam and a relatively long crank having a ratchet therein for operating the cam.

9. A device, as describerd in claim 6, in which the. said mechanical means comprises sprockets mounted on the outer end of the lever and positimed to engage racks in the frame, and a crank having a ratchet. therein by which said sprockets may be; rotated.

10. In combination with a device as described in claim 6,. a nut removably mounted on said jack 10 means removably mounted on the jack pin for drawing objects together with the pin extending through holes therein, and retaining means also adapted to extend through holes adjacent said device comprising bolts with fiat extending ends and a nut having a cam for holding said extending ends.

12. A multi-lever jack comprising a relatively long lever fulcrumed at one end with a cam jaw beyond the fulcrum, a ratchet freely movable in said jaw, a slidable member having teeth meshing with teeth of the ratchet, means gripping a pin by the slidable member, locking means holding the slidable member, another lever fulcrumed adjacent the outer end of the former lever, and a cam operated by the latter lever adapted to engage the former lever to force the former lever downward as it is operated.

EDWARD MOLLOY. 

